I am not so sure about this one, sounds more like a local wish.I had already 2 pencilled in for China for 2020: Jinggangshan--North Wuyishan (Extension of Mount Wuyi) and Chinese Section of the Silk Road. And you had the City Walls of the Ming and Qing Dynasty in your last summary, winterkjm. They can only have 1 nomination.

If anything, China's world heritage candidature selection process has become more difficult to ascertain! There are so many nominations that are in the pipeline, yet their dossier status varies substantially. Its also very difficult (using Google Translate) to differentiate between hopeful candidates and submitted nominations ready to be evaluated by the Advisory bodies? Reports about the Western Xia Imperial Tombs are coming from major newspapers throughout China, so I'm not sure we can completely rule this nomination out.

I can count no less than 9 sites that seem to be vying for the right to submit their nomination in the coming years.

I think this will be later (2021 at the earliest) - they got a Deferral this year, would be too quick to revise the whole nomination before 1 Feb 2019. Also, Netherlands will be the leading (and probably only) State Party and it already has Nieuwe Hollandse Waterlinie scheduled.

Myauk-U seemed to be on track, but with the Rohingya refugee crisis and the unrest and violence in Rakhine State, this nomination may have been shelved. Original article (Jan 2018)) that indicated 2020. Here is the (April 2018) article that claims the nomination has been put on hold.

Sweden's only remaining tentative nomination is something of an enigma, since we don't really know much about this nomination except for vague reports more than one year ago. There was even talk of a transnational nomination. I've searched considerably, but there has been nothing since March 2017 in this article. This was a hopeful article, stating at the earliest the nomination could be submitted in February 2019.

Has the original Ancient Plovdiv nomination been replaced with a more narrowed version? If so, its unlikely we'll see this nomination in 2020, right?

The report said the government already submit document to UNESCO and is now underway to present the corresponding documentation, so that next year (2020 WHC?), La Isabela, historic city of Puerto Plata will be declared a World Heritage Site

Regarding the potential Dominican Republic nomination, I think its clear the article is referencing the addition of La Isabella to the state parties tentative list.

Archaeological Site of Villa La Isabela was submitted as a tentative nomination in 05/02/2018